n Control Panel
Inside of control panel, PLC(Programmable Logic Controller) which is actual Main controller and
other related components are located.
PLC controls compressor and volume control valve through outlet port sensing sensor and switch
condition through input port. Also PLC communicate with touch panel which is HMI(Human
Machine Interface) Equipment through exclusive communication port, if it is connected to BMS, it
provides interface function through exclusive communication port.
PLC power input is 24V AC 50Hz and it gets its power from transformer which is located in power
SMPS(Switching Mode Power supplier) is equipment that making 24V DC power using 220V AC
50Hz power, it provides power to touch panel.
Fuse protects circuit from over-current used for 220V AC control circuit input and power input of
- 25 -
Operation & Maintenance Manual